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Its probably just a broken key on the keyboard. If you know someone with a usb keyboard then plug it in and see if the FN key on that responds. if it does then it is the keyboard at fault.I would buy a new keyboard.

You probably activated the "Num Lock" accidently. Just hold down the FN and look for the key that says "num lock" Now you should have your keyboard back and the numbers will just type when you hit the numbers key. I did this to myself yesterday!